Improvement in making glass letters, numbees



uiten tetra inganni @frn IMPROVEMENT IN MAKING GLASS LETTERS, NUMBERS,te.

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TO ALL WHM IT MAY CONCERN: A

Be it known thutI, OTTO STIETZ, of the city, county, and State ofNewYork, have invented u. new and useful Improvement in Glass Letters,die. and l do hereby declare the following to be a full, clear, andexact description of the nature, construction, and operation of thesame, sufficient to enable one skilled in the art to which it appcrtainsto construct and use the same, reference being had to the accompanyingdrawings, which are malle p'nrt of this specification` and in which thesame letters.indicate similar parts.

Figure 1 is a face view.

Figure 2 is a section on the line a b, iig. 1.

The object of the invention is to give an apparent relief` to the giltface'of the letters without affecting the plain surface of the glass onwhose rear the letter is attached. lt is accomplished by etching in theface of the letter on the reverse side of the glass, and causing thefoil or metallic leaf luid thereupon to overlap upon the unetehed orplain surface of the glass. I

In the drawings, A represents the plate of glass', and B the face of.the letter, which is etched in on the reverse side' by means of fluor-icacid. `The action of the acid upon the glass has the eteetl of giving ita dull, dead, or frosted surface, and the metal Cl being laid upon it,and lapping upon thc plain or unfrosted surface, t'orms a brighterbandaround the comparatively dead face of the letter, and gives theeti'eet of a bevel edge and an appearance of saliency to the letter.Among the advantages ot' this mode of forming letters and figures may becited that they are more easily constructed than letters in which theedge of the glass letters is bevelled to give the required relief. Theyare also much more easily cleansed than'letters which have pieces of theedge cut out, or pieces bored or ground out of the centre, as in theletters O, D, It, B, die., besides which many letters are fractured inthe opera-tion. The openings afford places for dirt te accumulate andfor wet to leak in behind the glass, and loosen the cement by which theyare fastened; and letters so formed are inferiorin regard t0 cheapness,cleanliness, and safety, to those formed according teu-any improvement.l

Having thusv described my invention, whatl claim as new, and desire tosecure by Letters Patent, is

A letter formed upon the reverse side of a piece of glass, by means ofetching in the face of the letter and covering it with a surface ofmetal or foiling, lapping upon the unetched portion, thereby producingan appearance of relief, substantially as described.

To the above specification of my invention I have signed my name this20th day of February, 1867.

OTTO STIETZ.

Witnesses:

JOHN A'. WIEDERSHEIM, A. M. TANNER.

